Press for making glass insulators or similar articles.



No. 835,235., .PA'I'ENI'ED NOV. 6; 1906. 'H; M. BROOKFIELDS w. D. STIVERS. PRESS FOR MAKING GLASS INSUL'ATORS OR SIMILAR ARTICLES.

APPLICATION FILED JAN-30. 1902.

8 SHEETS-43321 1.

L a H r rekri NVENTORS ATTORNEYS rnl uonms Prrzks Ca. Husumcron, a. c

PATENTED NOV. s, 1906. H. M. BROOKPIELD & w. n. STIVERS..

PRESS FOR MAKING GLASS INSULATORS 0R SIMILAR ARTIGILESQ APPLICATION FILED JAN-30, 1902.

0 SHEETS-SHEET 2.

Aa TOR N E Y S No. 835,235. PATENTED NOV; 6, 1906. H. M. BROOKFIELD & W. D. STIVERS. PRESS FOR MAKING GLASS INSULATQRS OR SIMILAR ARTICLES.

APPLICATION FILED JAN.30. 1902.

6 SHEETS-411E121 3.

INVENTOR 8 ATTORNEYS H. M. BROOKFIELD & W. D. STIVERS.

PRESS FOR MAKING GLASS INSULATORS OR- SIMILAR ARTICLES. APPLICATION FILED umao. 1902.

WITNESSES:

PATENTED NOV. 6, 1906.

B SHEETS-SHEET 4.

INVENTQRS ATTORNEYS I PATENTED NOV. 6, 1906.

H. M. BROOKPIELD & W. n. STIVERS. PRESS FOR MAKING GLASS INSULATORS 0R- SIMILAR ARTICLES.

APPLICATION FILED JAN.30. 1902.

6 SHEETS-SHEET 5- nlllllll f 45 l 2H! I I r A I V I |NVENTOR ATTORNEYS m: ncnlus PETER: cm. wuumaran, m c,

K W KW No. 835,235. PATBNTBD NOV. 6, 1906. H. M. BROOKPIELD & W. n. STIVERS. PRESS FOR MAKING GLASS INSULATORS 0R SIMILAR ARTICLES.

APPLICATION FILED JAN-30, 1902.

6 SHEETS-SHEET 6.

A INVENTORY m ATTO/FEEYS WITNESSES:

WM, L9 Mai.

, a to make them more regular and 2o form, and to revent distortion an injury to in -is a specification.

'ri'EiniY M. BROOKFIELD, oF'NEw YORK, N. Y. AND WILLIAM D. sTIvERs, OF-JEESEY-CITY. NEW JERSEY; SAID STIVERS ASSIGNOR 'ro I'SAID ness FOR MAKING GLASS INsuLA'roRso SIMILAR ARTICLES;

. f ne. 835,235.

To all.wh0 m it may concern:

Bejit knownthat-we, HENRY M. BROOK- a resident ofthe city, county, and State of New York, and WILLIAM D. STIVERS, a-resident 01' Jersey City, county of Hudson, New Jersey, citizens of the United States,

have invented certain new and useful Iml rovementsin Presses forMakin Glass Insuatois or Similar Articles, of whic the follow- 1, his invention relates to resses for makingglass insulators or simi ar articles. Its 'iobject is toim rove and simplify the construction of sue presses, to increase their ca- 1 5 'pacity and efficienc to make them more truly automatic, to ecrease the cost of making-msulators or similar articles, to improve the quality of such insulators or articles and erfect in I thes'ame whi e being made; also, to improve the construction of molds for such presses, to

1 cause the molds to discharge the insulators or other articles with greater certainty and 5' without distortion or 111 111;, to improve the means for opening or c osmg the molds, to make such operation automatic, and to cause 'itile lower parts of the molds to open before the upper parts; also, to improve the means A 39' fo'r'operating and controlling the screws used n to'formthe insulators or other articles, to lock the spindle and screw when the latter is Kin "the. insulator and is being screwed out therefrom to prevent injur to the screwthreads of the insulator; aso, to hold and lock the screw in the neck of the insulator until the latter is discharged from the mold;

'. lalso, to improve and make more certain and automatic the means for rotating the screwspindle or unscrewing the screw out of the insulators; also, to provide means for adjustin such. mechanism; also, to provide suitable means for cooling the molds; also, to

rovide means for preventing excessive coolin of the upper part of the screw, and, general y, to unprove and make more efiicient the general 'mechanism of presses for making i glass insulators or similar articles. Our invention consists in the novel devices 59 ,and COIIIbIHatIOIIS herem shown and d escribed. I 'Inthe drawings accompan mg this specifi catiomahd forming a' part ereof we have I Specification of Letters Patent.

'. V Application filed January -30, 1902. Serial No; 91.858.

shown a form ofress for making glass insulators whlch em odies our invention in its preferred form, and we Wlll now proceed to describe the press shown in said drawings. a

--lED.. STATES PATE 3 Referring to the drawings accom anying this specification, Figure 1 1s a side e evation form. Fig. 2 is a central vertical secof a ress involving our invention in its pre'. ferre tion of the same. Fig. 3 1s a top view of the I same with certain parts broken away to more 1 clearlyillustrate t e construction.

1 4 isa horizontal section on the lines A A of 'gI-l.

Fig. 5 is a detail of, a single screw and. its spin- 2; dle and cross-head and a single mold and'con- 4 necting. arts.

Fi 6 is a detail of the cross? head. *ig. 7 is a etail of themoldi v 8 I is a vertical section through a screw'andit-s spindle to illustrate the means for cooliiigthe screw and for preventing excessive coolin Our invention'fmay be embodied in ot or forms of ress than that shown the drawings and ereinafter described. VVe-will now proceed, however, to describe the specific form or embodiment of our invention as illustrated in the said drawings.

The press here shown is a tum-table press dprovided with six molds, each mold provi ed with its'screw-plunger and screwspindle, the molds, the screws, screw-spindles, plungers, and connecting arts being all mounted on the table and revoluble around a central standard. Referring to this press, 1 is the framework of the same, 2

the turn-table, revolubly mounted around a central stationary standard 3 by means of a sleeve 4, worm-wheel 5, secured thereto, and

worm 6, driven from any suitable source of power. the turn-tab ber. These molds and their method of operation will be described in detail later on.

For each mold there is provided a screw 8 of the usual construction for forming the in-- sulators, a spindle 9, to which the screws are secured, a plunger 10, forming part of and integral with cross-head 11, and the follower 12 in a manner presently to be described. To the upper part of spindle 9 issecured a cord 13, from which depends a weight l if'or raising the screw and its spindle, which'Will be presently described.

The screw and its s indle are depressed by the weight of the p unger and cross-head 7 represents the molds mounted upon e 2, and, as shown, are SLX in num- IOO throu shoul er of the screw, as shown 1n Figs. 2 and 5, when the latter are permitted to move downward by a cam 15, which, as shown, is in the form of a circular track, the raised portions of the same lifting the cross-head, plunger, and follower thropgllli a roller 16, secured to the cross-head. 'le the spindle and screw are forceddownward by the plunger and cross-head, the upper movement of the latter has no eflect on the screw and spindle, as will be resently described. The follower is made e astic by being movably mounted on pins 17, secured to the cross-head, and springs 18, surrounding the pins, as shown in Fig. 5.

In practice after a mold has received the proper supply of molten glass the screw and its spindle are depressed by the continued rotation of the turn-table through the cam and plunger, as above described, and the glass insu ator is formed in the mold. At the proper time the spindle and screw are rotated to turn the screw out of the screwthreads formed in the interior of the glass insulator. The mold is then 0 ened to permit the insulator to fall out o it upon any suitable receptacle.

In practice we prefer to use lockin means for locking the spindle and screw w en the screw is in the glass or in the mold to counteract the upward pull of Wei ht 14 or any other means used to raise t e spindle and screw. In this way all strain is removed from the threads formed in the glass insu lator or other article while the screw remains in the insulator. The locking device may be made of any suitable form; but in practice we prefer to use a screw-threaded nut, preferably a split screw-threaded nut, as shown at 19, by providing the spindle with threads 20, corresponding to those on screw 8. We provide any suitable means for causing the nut to engage with the threads on the spindle or to be isconnected therefrom, as will be presently described. By using screw-threads on the spindle correspondin to those of the screw al strain is removed om the threads formed in the glass insulator or other article as the spindle is rotated and the screw is raised from the glass threads of the insulator.

Any suitable means may be provided for rotating the spindle and screw at the desired moment. We prefer to use a common driving gear-wheel, such as 21, driven continuously from any suitable source of power and connecting this gear-wheel with the spindle through a clutch, which is preferably automatically thrown into and out of operative position at the proper times. In the form shown in the drawings gear 21 is driven from any suitable source of power through pulley-wheel 22, shaft 23, gears 24 25, and shaft 26.

By means of the common driving-gear 21 a h a shoulder of -'the-plungerstriking a I rotary motion is imparted tb any and all of the six spindles at the proper time. As shown, this is done through a horizontal shaft 27, provided with two gear-wheels, a gear 28 meshing with gear 21, and a gear 29, normally idle and mounted on a sleeve 30, encircling shaft 27.

31 is a clutch dprovided with a loose and fixed member a apted to operatively connect shaft 27 and gear 29, so that gear 29 will be rotated only when the clutch is o erative. This clutch is operated and timed through a bell-crank lever 32, having a surface 33 adapted to bear upon a cam 34, which is shown in the drawings in the form of a camtrack with raised and depressed portions.

Rotary motion is imparted from gear 29 to spindle 9 through gear 35 in the usual way, t e spindle being splined permitting longitudinal motion of the spindle through the gear, but imparting rotary motion to the spindle when gear 35 rotates. By these means the different spindles and screws are rotated at the time when it is desired to raise screw 8 out of the glass threads of the insulator.

The means for locking the spindle and screw can be widely varled. As shown in the drawings, they consist of a screw-threaded nut,wh1ch, as shown in the drawings, is preferably a spilt nut. As there shown, it consists of two parts, each mounted on a spring 36, suitably supported in the framework of the press. These springs are arranged so that they are adapted to move the parts of the split nut in one direction, as shown, to open the nut. They are pressed in the opposite direction by means of a cam 37, which is stationary and 1s secured to sleeve 3. The connections between the springs and cam consist of a bearin -surface 38, adapted to be pressed outward y the raised part of cam 37 when the latter strikes it, forcing outward the center art of three-armed lever 39. Each member of the three-armed lever consists of a bell-crank lever pivoted to the framework where the two arms of the lever meet, and each member is provided with fingers'40, grasping the springs 36 on each side, as shown clearly in Fig. 3. The two members forming the three-armed lever are loosely pivoted to each other, as shown in Fig. 3. When cam 37 and bearing-surface 38 contact, the parts of the split nut are forced together and engage with screwthread 20 on spindle 9. This movement is timed, so that the nut closes just as screw 8 has reached its lowermost osition in the molten glass in the mold. T e action of the nut and the screw-threads forms a lockin preventing any upward movement of spind e 9 under the influence of weight 14. Thus all strain is removed from the newly-formed glass threads of the insulator.

When the insulator has had time to cool 'sufliciently to permit the removal of the screw, the spindle is rotated by the means already described, unscrewing the spindle and screw upward until the screw 8 has 5 cleared the glass threads of the insulator. At this point we prefer to stop the rotary motion of the spindle, permitting screw 8 to remain in the neck of the insulator until the molds open and discharge the insulator. .For

10 this purpose while the rotary motion of the spindle has stopped the lock is still maintained on the spindle, or, in other words, in the form shown the nut 19 is still held closed, preventing weight 14 from pulling the spin- I 5 dle and screw still farther up. The purpose of thus holding screw 8 in the neck of the insulator is to aid in keeping the insulator straight vertically in case there should be any slight adhesion of the glass to the mold 220 on any side. 'If such adhesion occurs, as it often does practice in presses of this general character, the insulator is apt to tilt out of a vertical line as the molds are opening and jam in the molds, destroying the insuz 5 lator and sometimes blocking the pr'ess. The

resence of the screw in the neck of the insuator as the molds are opening tends to prevent such vertical displacement and prevents the injury to the insulator above recited and the blocking of the press. After the insulatorhas been discharged from the mold camsurface 37 andbearing-surface 38 through the continued rotation of the press cease to bear against each other and the split nut is 3 5 open, permitting weight 14 to pull spindle 9 and screw 8 into their uppermost position, as shown at the right in Fig. 2. At the left in Fig. 2 the spindle and screw are rotated in their lowest position with the screw in the 0 insulator, the nut closed, the clutch operative, and the spindle at the beginning of its rotary movement for raising the screw out of the threads of the insulator.

We preferably provide means for adjusting the position of cam 34 in order to vary, if desired, the times for rotating spindle 9. Any suitable means may be employed for this urpose. Those we have shownconsist of a and-wheel 41, provided with a ear 42,

5o meshing with a gear 43, secured to a s ecve 44 at its lower end, which sleeve is at its upper end secured to cam-plate 34.

Heretofore in presses of this general character, in which the molds are made of more than one part and are caused to open to automatically discharge the insulators, considerable difliculty has been experienced in preventing the insulators from sticking more or less to the molds and either injuring in a reater or less degree or destroying the insuators or blocking the press. We have dev1sed means for overcoming these difficulties Including new forms of molds and new means for opening and closing them. For this purfor opening and closing the molds. these consists of two sets. of cam-surfaces, one set for the molds and one for the plunger pose we divideourzmoldshorizontally into upper and lower sections, preferably into four sections, two upper and two lower, and provide suitable means for opening and closmg them, which are preferably automatic.

sulators are held in a more truly vertical position during the opening of the molds. They are not inclined to tilt out of the vertical line,

and thereby cause injury to themselves or,

block the mold, as has been a common occurrence heretofore in presses where molds opened automatically to discharge insulators.

Referring now to the specific form of our molds shown in the drawings and to the means there illustrated for opening and closing them, we divide each mold 7 into four sections, two upper sections 45 45, hinged together at 46, and two lower sections 47 47,-

hinged together at 48, as shown in Fig. 5, .where the mold is shown in its openposition.

We preferably provide automatic means- As shown,

cross-head, by the contact and 006 eration of which the molds are open an closed.

For each section of the mold there is provided a cam-surface, which can be connected to it by any suitable means. As shown, these cam-surfaces for the lower sections of the mold are cams 49, mounted on a rockshaft 50. This rock-shaft 50 is secured at its lower end to a link 51, pivoted to the outer end of one ofthe lower sections 47 of the mold. The two cams 49 are connected by a spring 52, tending to pull them toward each other.

53 53 are the cams for the upper sections 45 of the molds. upon a hollow rock-shaft 54; surrounding shaft 50, and at its lower end rock-sleeve 54 is pivotally connected to a link 55, and the latter pivotally connected to the outer end of one of the upper sections 45 of the mold. A spring 56 connectsitwo cams 53. The other set of cam-surfaces are connected with plunger 11. As shown, they consist of curved surfaces 57 on the outer faces of blocks 58, bolted to cross-head 11. The sha es of these sets of cam-surfaces are so ma e and arranged that the lower sections 47 of the mold will open before the u per sections 45 open. These surfaces may e varied, as desired. As they are shown the lower sections of the mold are open completely before the upper sections start to open. In practice we prefer this arrangement. If desired, how- Each cam 53 is moiuited ever, the cam-surfaces should be so shaped --tor, but is held in the neck of the insulator until the molds are opened and the insulator discharged, and all these steps are performed automatically and at the proper tlmes without injury to the insulators or to the press. The operation of the ress is rapid. Insulators are produced wit great ra idity.

The screw is preferably cooled by any suitable cooling medium and by any suitable device-such as is shown, for example, in Fig. 8, where a suitable cooling medium is supplied from any source through pipe 59 into a chamber 60 in the upper part 0 the screwspindle and is then carried through pipe 61 to chamber 62, formed in the interior of the hollow screw 8. In order to prevent excessive cooling of the upper part of the screw, which is not subjected to as great a heat as the lower part, we preferably em loy a shield arranged in the upper art of t e screw to prevent the cooling me ium from contacting directly with the walls of the up er art of the screw. In the form of the s iel which we show in the drawings this shield is shown as'a tubular cap 63, closely fitting the inner walls or a part of them to the upper part of the chamber and screw and provided with a flange 64, encircling ipe 61 and running to the top of the screw, but leaving an aperture 65 surrounding pipe 61, for the escape of the I cooling medium into a hollowed-out chamber 66 -in the spindle surrounding pipe 61, as clearly shown in Fig. 8. The waste cooling medium then escapes into chamber 67 in the upper part of the spindle out through pipe 68.

'By means of this-shield the cooling medium does not come directly into contact with the walls of the upppr part of the screw, and these parts can e kept at the proper temperature. Heretofore where it as been attem ted to cool the interior of a screw the ten ency has been to cool the upper part excessively, thus injuring the insulators and tending to crack or break them. Our improved device eifectually prevents such injurious consequences.

We also provide means for su lying a cooling medium directly to the mo l s themselves. -A cooling medium may be supplied from any suitable source and in any suitable way. As illustrated in Fig. 4, it is sup lied through a pipe 69 to a circular pipe 70, om whence it passes through pipe 71 into a hollowed-out chamber 72 1n each section of the mold. From there the cooling medium is discharged by any suitable meansas, for example, through pipes 73 74 75.

What we claim as new, and desire to secure by Letters Patent, is

1. A mold for making glass insulators or similar-articles divided horizontally into upper and lower sections and means for openmg and closing the upper sections and means for opening and closing the lower sections, the said means being so arranged that the lower section will open before the upper section opens.

2. In a press for making glass articles the combination of a mold divided horizontally into up er and lower sections, means automatical y actuated for opening and closing the said sections so arranged as to open'the lower section before the upper section opens. 3. A mold for making glass insulators or similar articles divided horizontally and vertically into four sections, two upper and two lower sections, and means for opening and closing the two u per sections and means for opening and c osing the two lower secand two lower sections, hinged so as to swing to open or close the mold, a plunger for maklng the insulators or other artlcles, and two sets of cam-surfaces -for closing or openlng the mold as the plunger moves toward or away from the mold, one set of such surfaces being connected with the plun er and the other set connected with the mdld, whereby the closing and opening of the mold will be controlled by the movement of the plunger.

5. In a press for making glass insulators or similar articles, a mold divided horizontally and vertically into four sections, two upper and two lower sections, hinged so as to swing to open or close the mold, a plunger for making the insulators or other articles, and two sets of cam-surfaces for closing or opening the mold as the plunger moves toward or away from the mold, one set of such surfaces being connected with the plunger and the other set connected with the mold, the shapes of said cam-surfaces being so arranged that the lower sections of the mold will open before the upper sections open.- 7

4 6. In a press for making glass insulators or similar articles, a mold divided horizontally and vertically into four sections, two upper and two lower sections, hinged so as to swing to open or close the mold, a plunger for making the insulators or other articles, a cam for each section of the mold mounted upon a rock-shaft, the shafts carrying the cams of .each half of the mold, made by the vertical div isionline, being-mounted one within the other, connections lg etween each shaft and its corresponding section of the mold, a spring connecting the cams of the upper sections of the mold, a spring connecting the cams of the lower sections of the mold, and cam-surfaces connected with the plunger, the said several cam-surfaces bein so shaped and arranged that the lower sections of the 1 o mold will open before the upper sections open.

7. In a press for ma similar articles, a plurality of molds for forming the insulators, each mold divided horizontally and vertically into four sections, two

I 5 upper and'two lower sections, hinged so as to s to open or closevthe mold, a lurality f p ungers for making the insuiators or other articles, onefor each mold, means for moving the plungers toward the molds to 2 form the insulators and to move them away from the molds, a cam for'each section of each mold mounted upon a rock-shaft, the

shafts carrying the cams of each half of a mold, made by the vertical division-line, be-

ing mounted onewithin the other, connections between each shaft and its corresponding section of its mold, a spring connecting the cams ofthe upper sections of each mold, a spring connecting the cams ofthe lower 3 sections of each mold, and cam-surfaces connected with each plunger, the said several cam-surfaces connected with each mold and plunger being so shaped and arranged that the lower sections of the mold will open be- I fore the upper sections open.

In a ress for making glass articles a mold divided horizontally into upper and lower sections, a plunger adapted to enter the mold and cam-surfaces for closing or 4 opening the mold as the plunger moves toward or away from it all so arranged that the lower section will open before the upper sectiono ens.

9. a press for making glass insulators or similar articles the combination of a screw for forming the insulators, means for forcing the screwinto the lass, of the insulator, meansfor unscrewing it Iromthe screw-threads formed in the glass insulator,. a lock for holding the 5 screw in the neck of the insulator, and means a for raising the screw to its normal position, when the lock is removed from operative position, whereby the screw, when withdrawn from the glass threads of the insulator, may be held in the neck of the insulator until the latter is discharged from the mold.

10. In a press for making glass insulators and similar articles the combination of a screw for forming insulators, a spindle for actuating the screw provided with threads corresponding to those on the screw, means for causing the spindle to force the screw into the glass in the mold, means for rotating the spindle to'withdraw the screw from the glass glass lnsulators or sulator, means for discharging the insulator from the mold, means for unlocking the lock and means for rais' the spindle and screw to their highest position.

11. In a press for making glass insulators or similar articles the combination of a screw for forming the insulators, a spindle for actuating the screw provided with threads corre.

to those on the screw, means for sponding1 raisin t e spindle, and as lit screw-threaded nut, t e parts of the nut eing suitably supported and adapted to be moved towardor away from one another to engage with or be free from the s indle, and means automatically actuated or causing the parts of the nut to engage with the threads on the spindle when the screw is lowered into the mold, and means for rotating the spindle to raise it, whereby all strain is removed from the threads formed in the glass insulator or other article.

12. In a press for making glass insulators or similar articles the combination of a screw for forming the insulators, a spindle for actuating the screw provided'with threads corre sponding to those on the screw, means for raising t e spindle, and a split screw-threaded nut, s rings each caqinga part of the nut and a apted to move t e said parts in one direction, a cam, connections between the cam and springs adapted when the cam is operative to press the springs so as to move the parts of the nut in the opposite direction, and meansfor renderi the camo erative,whereb the split nut wi 1 be close upon the spindie when the screw is lowered into the mold, and means for rotating the spindle to raise it, whereby all strain is removed from the threads formed in the glass insulator or other article, and whereby the nut will be kept closed until the spindle is to be permitted to rise from the mol 13. In a press for making glass insulators or similar articles the combmation of a screw for forming the insulators, a spindle for actuating the screw provided with threads correspondingl to those on the screw, means for raising t nut, s rings each ca a part of the nut and a apted to movd the said parts in one direction, a cam, a tog le-joint connected at its opposite ends with t e springs and having a surface adapted to bear upon the cam, when the latter is in operative position, to ress the springs so as to move the arts of t e nut in t e opposite direction, an means for renderm the cam operative, whereby the split nut W1 1 be closed uponthe spindle when the screw is lowered into the mold, and means for rotating the s indie to raise it, whereby all strain is remove from thethreads formed in the glass e spindle, and a split screw-threaded insulator or other article, and whereby the nut will-be kept-closed until the spindle is to be permitted to rise from the mol 14. In a press for makin glass insulators or similar articles the combination of a screw for forming the insulators, a spindle for actuating the screw provided with threads corresponding to those on the screw, a plunger adapted to move vertically, means for mov- Io} ing it vertically, the plunger and spindle being so connected that the plunger in its down- Ward movement will carry the s indle downward to press the screw into t e mold, but

, may move upward independentl of the spin- 1% die, means for rotating the spin Is to raise it, a screw-threaded nut ada ted to engage with the threads on the spin le, all so arranged that all strain is removed from the threads formed in the insulator or other article while the screw is in the mold or being screwed up therefrom, and the spindle and screw will be held locked with the screw in the neck of the insulator, until the latter is discharged from the mold, when they will be unlocked and I a 5 raised to their highest position.

15. In a press for making glass insulators or similar articles the combination of a plurality of molds, a plurality of screws for forming the insulators, a.spindle for actuat- 0 ing each screw provided with threads corresponding to those on the screw, means for raising the. s indles, a screw-threaded nut for each spin le adapted to engage with the threads on its spindle when the screw is lowered into the mold, means for causing the nuts to engage with the threads on spindles when the corresponding screws are lowered into the molds, common means for rotating the spindles, connections between such com- 4o mon means and each spindle, including a clutch and a cam for controlling the clutch, whereby all strain is removed from the threads formed in the glass insulator or other article.

16. In a press for making glass insulators or similar articles the combination of a screw for forming the insulators, a spindle for actuating the screw provided with a gearwheel, a horizontal shaft provided with two gear-wheels, one normally idle and meshing with the gear-Wheel on the spindle, the other meshing with a driving gear-wheel and turning therewith, a clutch on the said shaft adapted to operatively connect or disconnect said gear-wheels mounted on the shaft, whereby the spindle will be rotated only when the clutch is operative.

17. In a press for making glass insulators or similar articles the combination of a screw forforming the insulators, a spindle for actuating the screw provided with a gearwheel, a horizontal shaft provided with two gear-wheels, one normally idle and meshing with the gear-wheel on the spindle, the other meshing with a driving gear-wheel and turn ing therewith, a clutch on the said shaft adapted to operatively connect or disconnect said gear-wheels mounted on the shaft, a cam, and a surface connected with the clutch and adapted to bear upon the cam, all so arranged that the spindle will be rotated only when the screw is to be raised out of the insulator or other article.

18. In a press for making glass insulators or similar articles the combination of a plurality of molds, a plurality of screws for forming the insulators or other articles, a spindle for actuating each screw provided with a gear-wheel, a common driving gearwheel, a horizontal shaft for each spindle provided with two gear-wheels, one normally idle and meshing with a gear-wheel on its spindle, the other meshing with a common driving gear-wheel and turning therewith, a clutch on each horizontal shaft adapted to operatively connect or disconnect the gear-wheels mounted on that shaft, a cam, and a bearing-surface connected with each clutch adapted to bear upon the said cam, all so arranged that each spindle will be rotated only when its screw is to be raised out of the insulator or other article.

19. In a press for making glass insulators or similar articles the combination of a plurality of molds, a plurality of screws for forming the insulators or other articles, a spindle for actuating each screw provided with a gear-wheel, a common driving gearwheel, a horizontal shaft for each spindle provided with two gear-Wheels, one normally idle and meshing with a gear-wheel on its spindle, the other meshing with a common driving gear-wheel and turning therewith, a clutch on each horizontal shaft adapted to operatively connect or disconnect the gear-wheels mounted on that shaft, a cam, and a bearing-surface connected with each clutch adapted to bear upon the said cam, all so arranged that each spindle will be rotated only when its screw is to be raised out of the insulator or other article, and means for adjusting the said cam.

20. A screw for making glass insulators or similar articles provided with means for supplying a cooling medium thereto to prevent excessive heating of the screw and a shield arranged in the upper prevent the cooling me ium from contacting with the walls of the upper art of the screw to avoid excessive cooling 0 such parts.

21. In a press for making glass insulators or similar articles the combination of a hollow spindle, a hollow screw secured thereto for forming the glass insulators or similar articles, a ipe running through the center of the spin le and into the screw and opening in the lower part of the latter for supplying a cooling medium to prevent excessive heatart of the screw to ll i l ing of the screw, a tubular shield arranged In testimony whereof we have signed our :0 around the said s'uppl'y pipe in the upper names to this specification in the presence'of Hart 011:! the screw to prevent tlhe copllingf mletwo subscribing witnesses.

ium' 0m contacting with t e we s 0 t e 5 upper part of the screw to avoid excessive I cooling of such parts and so arranged as to leave an opening between its stem and the Witnesses: said supply-pipe to ipermjt the discharge of JOHN O. GEMPLES, the 000 ing medium om the screw. EDWIN SEGER. 

